What

Vender is free open source VMC (Vending Machine Controller).

Status:

• MDB adapter hardware module - works
• VMC - in development
• Configuration editor - planned

Hardware

Required for VMC:

• Works on RaspberryPI and OrangePi Lite (H3). Possibly anything with GPIO that runs Go/Linux.
• MDB signal level inverter and current limiter - required, see files in hardware/schematic
• MDB adapter, takes care of 9bit and timing, we use ATMega328p with hardware/mega-firmware It is not mandatory, software option is available: https://github.com/temoto/iodin

Supported peripherals:

• MDB coin acceptor, bill validator
• Evend MDB drink devices
• any MDB device via configuration scenarios (work in progress)
• MT16S2R HD44780-like text display
• TWI(I2C) numpad keyboard
• SSD1306-compatible graphic display (planned)

Design

VMC overall structure:

• engine (see engine packages) executes actions, handles concurrency and errors
• device/feature drivers provide actions to engine
• configuration scenario specifies action groups and when to execute them